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The Electronics And Telecommunications Research Institute patent solves the following problem:
The present invention relates generally to a head Optical recording and / or reproducing information on or from an optical or magneto-optical disc (disk) using optical or magneto-optical characteristics, and especially , an Optical head with an innovatively reduced thickness.
Our analysis of this patent is as follows:
Electronics And Telecommunications Research Institute’s patent US 7580336 B2 deals with Optical head having a beam input/output coupler on a planar waveguide.
An Optical head with a beam input / output coupler with a planar waveguide and other parts including: a light transmitting element emitting a beam; a planar waveguide formed on a substrate and receive beams oscillated from the light transmitting element; a beam input / output coupler integrated as a thin film on a portion of the planar waveguide and receive beams by planar waveguide passing timber vertically into a disc position on the planar waveguide or passing beam reflected from the disc through the planar waveguide; and light receiving elements to receive the beam propagated in planar waveguide through the beam input / output coupler.
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